Increase retry logic for gpmfr
Increase retry logic for gpmfr

This ping test can sometimes fail. We previously added retry logic which
significantly reduced failures, but some are still present.

greenplum-db/gpdb,greenplum-db/gpdb,xinzweb/gpdb,kaknikhil/gpdb,yuanzhao/gpdb,cjcjameson/gpdb,greenplum-db/gpdb,ashwinstar/gpdb,xinzweb/gpdb,janebeckman/gpdb,50wu/gpdb,Chibin/gpdb,yuanzhao/gpdb,lisakowen/gpdb,janebeckman/gpdb,50wu/gpdb,adam8157/gpdb,ashwinstar/gpdb,xinzweb/gpdb,edespino/gpdb,Chibin/gpdb,janebeckman/gpdb,yuanzhao/gpdb,cjcjameson/gpdb,greenplum-db/gpdb,jmcatamney/gpdb,xinzweb/gpdb,Quikling/gpdb,cjcjameson/gpdb,cjcjameson/gpdb,jmcatamney/gpdb,jmcatamney/gpdb,50wu/gpdb,yuanzhao/gpdb,greenplum-db/gpdb,Chibin/gpdb,xinzweb/gpdb,cjcjameson/gpdb,Quikling/gpdb,jmcatamney/gpdb,lisakowen/gpdb,kaknikhil/gpdb,kaknikhil/gpdb,ashwinstar/gpdb,lisakowen/gpdb,50wu/gpdb,cjcjameson/gpdb,kaknikhil/gpdb,jmcatamney/gpdb,janebeckman/gpdb,cjcjameson/gpdb,Quikling/gpdb,kaknikhil/gpdb,jmcatamney/gpdb,Quikling/gpdb,janebeckman/gpdb,ashwinstar/gpdb,Chibin/gpdb,lisakowen/gpdb,lisakowen/gpdb,adam8157/gpdb,Chibin/gpdb,greenplum-db/gpdb,ashwinstar/gpdb,janebeckman/gpdb,50wu/gpdb,50wu/gpdb,adam8157/gpdb,Chibin/gpdb,50wu/gpdb,cjcjameson/gpdb,edespino/gpdb,edespino/gpdb,janebeckman/gpdb,yuanzhao/gpdb,kaknikhil/gpdb,Quikling/gpdb,adam8157/gpdb,edespino/gpdb,edespino/gpdb,adam8157/gpdb,Quikling/gpdb,edespino/gpdb,ashwinstar/gpdb,janebeckman/gpdb,lisakowen/gpdb,xinzweb/gpdb,ashwinstar/gpdb,kaknikhil/gpdb,adam8157/gpdb,adam8157/gpdb,Chibin/gpdb,adam8157/gpdb,Quikling/gpdb,yuanzhao/gpdb,cjcjameson/gpdb,greenplum-db/gpdb,cjcjameson/gpdb,janebeckman/gpdb,lisakowen/gpdb,jmcatamney/gpdb,Quikling/gpdb,Chibin/gpdb,kaknikhil/gpdb,yuanzhao/gpdb,kaknikhil/gpdb,xinzweb/gpdb,edespino/gpdb,yuanzhao/gpdb,Quikling/gpdb,edespino/gpdb,ashwinstar/gpdb,Chibin/gpdb,xinzweb/gpdb,yuanzhao/gpdb,kaknikhil/gpdb,greenplum-db/gpdb,jmcatamney/gpdb,lisakowen/gpdb,Quikling/gpdb,edespino/gpdb,edespino/gpdb,yuanzhao/gpdb,janebeckman/gpdb,Chibin/gpdb,50wu/gpdb